[英]Error setting layout params to ImageView
我在嘗試將layoutparams
設置為以編程方式創建的ImageView
遇到問題:
imageView.setLayoutParams(new LinearLayout.LayoutParams(gallerySize.x, gallerySize.y));
imageView在LinearLayout
,我認為應該可以,但是出現此錯誤:
09-30 10:33:24.450: ERROR/AndroidRuntime(5418): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
也許事實是,此imageView Activity被配置為對縱向和橫向視圖使用不同的布局(我在layout-land文件夾中使用了xml布局的不同副本)。 在縱向視圖中,不執行有問題的代碼行,而是執行以下行:
imageView.setLayoutParams(new Gallery.LayoutParams(gallerySize.x, gallerySize.y));
我試圖保持此行不變,但隨后出現錯誤:
09-30 10:49:47.450: ERROR/AndroidRuntime(5760): java.lang.ClassCastException: android.widget.Gallery$LayoutParams
縱向和橫向布局的主要區別在於,縱向使用具有垂直方向的LinearLayout
並具有Gallery
小部件(使用該imageView),而有問題的橫向則使用水平方向和ListView
而不是Gallery
。
我在這里迷路了,任何提示將不勝感激。
已編輯
imageView在此類中實現:
public class ImageAdapter extends BaseAdapter {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
Bitmap temp = BitmapFactory.decodeFile(appFolder+"/"+imagesPath[position]);
//productImages[position] = temp;
imageView.setImageBitmap(temp);
if(landscape)
imageView.setLayoutParams(new LinearLayout.LayoutParams(gallerySize.x, gallerySize.y));
else
imageView.setLayoutParams(new Gallery.LayoutParams(gallerySize.x, gallerySize.y));
imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageView.setBackgroundResource(mGalleryItemBackground);
return imageView;
}
}
在這里使用ImageAdapter實例:
public onCreate(...) {
...
if(!landscape) {
Gallery gallery = (Gallery) findViewById(R.infoproduto.gallery);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View v, int position, long id) {
setSelectedImage(position);
}
});
}
else {
ListView galleryLView = (ListView) findViewById(R.infoproduto.galleryLView);
galleryLView.setAdapter(new ImageAdapter(this));
galleryLView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View v, int position, long id) {
setSelectedImage(position);
}
});
}
}
好吧,我想出了解決方案,它是如此明顯!
ImageView在ImageAdapter內部使用,並且此ImageAdapter在ListView實例中設置為適配器:
ListView galleryLView = (ListView) findViewById(R.infoproduto.galleryLView);
galleryLView.setAdapter(new ImageAdapter(this));
因此,我不是使用LinearLayout.LayoutParams(這是我的xml文件中唯一的布局),而是使用ListView.LayoutParams,它可以完美運行!
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